Guys there are a lot of different Myriophyllum species. While Parrots Feather is a Myriophyllum it is not a plant you can keep underwater for any duration. What he has shown in the picture is Myriophyllum heterophyllum, aka red myrio or Fox Tail. Myriophyllum aquaticum is the plant that is commonly refereed to as Parrots Feather.
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